autocomplete function for addresses and suggestion as drop down [closed] - swift

Question

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 4 years ago.
Improve this question
I working with swift 4 for osx and I would like to realize a address autocomplete function like apple maps does:
How can I do something like the image shows?
I guess the structure will be:
a simple NSTextfield
but what is the popup menu? is it a simple popover?
UPDATE
Now my app works like this:
Thats brilliant.
But one little problem:
I write my first character into the textfield, the popover will be shown and the textfield lost the focus. Now I have to click again in my textfield to go on. Is there a way to keep the focus of this textfield?

Answer 1

I ported the Apple "CustomMenus" example from Objective-C to Swift. The example includes a search completions dropdown menu for NSSearchField:
https://github.com/dougzilla32/CustomMenus
Original example on the Apple site in Objective-C:
https://developer.apple.com/library/content/samplecode/CustomMenus

Answer 2

i solve the situation like this:
use the controlTextDidChange and present a popover
override func controlTextDidChange(_ obj: Notification) {
vcAddress.searchString = txtSourceAddress.stringValue
self.presentViewController(vcAddress, asPopoverRelativeTo: txtSourceAddress.bounds, of: txtSourceAddress, preferredEdge: .maxX, behavior: .semitransient)
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "AutoComplete"), object: nil)
}
the popover has a tableview, which gets the suggestions with the SearchCompleter (MapKit)
import Cocoa
import MapKit
class AcAddress: NSViewController, NSTableViewDelegate, NSTableViewDataSource, MKLocalSearchCompleterDelegate {
var searchString:String?
var searchCompleter = MKLocalSearchCompleter()
var searchResults = [MKLocalSearchCompletion]()
#IBOutlet weak var tblAutoComplete: NSTableView!
override func viewDidLoad() {
NotificationCenter.default.addObserver(self, selector: #selector(AutoComplete), name: NSNotification.Name(rawValue: "AutoComplete"), object: nil)
searchCompleter.delegate = self
tblAutoComplete.refusesFirstResponder = true
}
#objc func notificationAutoComplete() {
searchCompleter.queryFragment = searchString ?? ""
}
func completerDidUpdateResults(_ completer: MKLocalSearchCompleter) {
searchResults = completer.results
tblAutoComplete.reloadData()
}
func numberOfRows(in tableView: NSTableView) -> Int {
return searchResults.count
}
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
// FILL IT
}
}